(:notitlegroup:) 

   @article{seong89,
    title     = {Boundary Integral Method for Acoustic Propagation in Laterally Inhomogenous
                Medium},
    author    = {W. Seong and Henrik Schmidt},
    journal   = {Journal Acoustical Society of America},
    pages     = {S54},
    volume    = {86(S1)},
    year      = {1989}}